The hidden files are in place to keep user program setup and other program information.

I strongly suggest you to not delete those files.

If you a sure to want to delete them, then open the menu
Places->Home Folder (press CTRL+H if you don't see hidden files)
and then select and press the Delete keyboard key.
If you don't want move them into trash press Shift+Delete keyboard keys

From terminal you can delete hidden files ( don't do it ) with:
rm -fr /home/youruser/.*